Model Term

Parameter Effect

Coefficient

SD

T-value

P-value

Constant

74.87

2.60

28.77

0.000

X1

7.275

3.638

0.703

5.18

0.000*

X2

1.642

0.821

0.703

1.17

0.260

X3

−1.475

−0.737

0.703

−1.05

0.310

X4

4.183

2.092

0.703

2.98

0.009*

X1*X1

−0.230

−0.115

0.322

−0.36

0.726

X2*X2

0.395

0.198

0.322

0.322

0.548

X3*X3

−2.555

−1.277

0.322

−3.97

0.001*

X4*X4

−0.492

−0.246

0.322

−0.76

0.456

X1*X2

−0.712

−0.356

0.430

−0.83

0.420

X1*X3

−0.037

−0.019

0.430

−0.04

0.966

X1*X4

3.919

1.959

0.430

4.55

0.000*

X2*X3

−0.787

−0.394

0.430

−0.92

0.374

X2*X4

−2.244

−1.122

0.430

−2.61

0.019*

X3*X4

−0.744

−0.372

0.430

−0.86

0.400